DoepferA-124 VCF5 Wasp Filter


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Doepfer A-124

The Doepfer ‘A-124 VCF 5 Wasp Filter’ is a special 12dB multimode filter Eurorack module using the “strange” filter circuit of the “EDP Wasp” (an analog synthesizer with a black/yellow case built at the end of the seventies, manufactured by the UK company “Electronic Dream Plant”). This design “abuses” digital inverters as analog operational amplifiers leading to distortions and other "dirty" effects that generate the specific sound of this filter. The filter is equipped with a band pass output and a combined low/notch/high pass output. For this output a control knob defines the relation between low and high pass signal. If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates. The module does not feature self oscillation in contrast to most of the other filters of the A-100 system. 

A-124 Features

  • 12dB Multimode Filter Module based on the EDP Wasp Synthesizer
  • Filter drives to nice distortions and other “dirty” effects
  • Audio Level Control
  • Frequency Cutoff Control
  • CV 2 Control
  • Resonance Amount Control
  • Filter Mode Mix Control (CCW LP, CW HP)
  • Inputs: Audio, CV 1, CV 2
  • Outputs: BP Out, LP/HP Out
  • Eurorack Module
  • 8 HP Width
  • 45mm Depth
  • Current Draw: 30mA @ ±12V
SignalRelated ArticlesBuying Guide: Eurorack FiltersFrom Classics to New Approaches to Modular Synth Filter DesignPioneering a Format: the Doepfer A-100 SystemAn Overview of the Original Eurorack Modular Synthesizer System
Doepfer A-124 VCF5 Wasp Filter Reviews